# std::promise<R>::get_future

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< cpp‎ | thread‎ | promise

std::future<R> get_future(); |  | (since C++11)

Returns a future object associated with the same shared state as *this.

An exception is thrown if *this has no shared state or `get_future` has already been called. To get multiple "pop" ends of the promise-future communication channel, use std::future::share.

Calls to this function do not introduce data races with calls to set_value, set_exception, set_value_at_thread_exit, or set_exception_at_thread_exit (therefore they need not synchronize with each other).

### Parameters

(none)

### Return value

A future referring to the shared state of *this.

### Exceptions

std::future_error on the following conditions:

- *this has no shared state. The error code is set to `no_state`.

- `get_future()` has already been called on a promise with the same shared state as *this. The error code is set to `future_already_retrieved`.

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